@startuml
actor client
agent "web interface" as WEB_UI
agent "ios app" as IOS_APP
agent "telegram app" as TG_APP

frame docker:f1tness_db {
    database "PostgreSQL" as db
}

frame docker:fastAPI {
    node backend_API
    node frontend_renderer
}

client <--> WEB_UI
client <--> IOS_APP
client <--> TG_APP

WEB_UI <--> frontend_renderer
IOS_APP <--> backend_API
TG_APP <--> backend_API

backend_API --> db
@enduml